The volume considers the theories of the passions in Hobbes, Descartes and Spinoza. Particular attention is given to the passion of fear, highlighting how these three writers considered fear as both an individual and a collective affect. Cerrato underlines the characteristics, relevance and usefulness of these affects, together with the strategies of control used to prevent their transformation into passions that can inhibit rational action. He then demonstrates the divergence of views between Descartes, Hobbes and Spinoza in terms of how they delineate these conditions. The second part of the volume focuses on analogies concerning rational strategies that a human being can assume in order to manage fear. Together Descartes e Spinoza, it is necessary to recall Hobbes’s Leviathan, since this work is a consistent and relevant source for Spinoza, as far as the conception of fear as a peculiar perception of past and present is concerned.